NPT Pipe Straight Union, FNPT
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Notes:
- The PU12 has a PFA encapsulated Viton® o-ring as an internal face-to-face seal.
- All unions use a natural PVDF lock nut.
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Applications
- High purity, chemical handling applications in the semiconductor industry
- Corrosive applications in the chemical industry
- Corrosive, high purity Laboratory applications
Specifications
| Part Number | FNPT Size | Orifice | Dimension A | Dimension B | Hex |
| PU2 | 1/8" | 0.25" (6.4 mm) | 1.84" (46.7 mm) | 0.63" (16.0 mm) | 1 1/4" |
| PU4 | 1/4" | 0.35" (8.9 mm) | 1.84" (46.7 mm) | 0.75" (19.0 mm) | 1 7/16" |
| PU6 | 3/8" | 0.44" (11.2 mm) | 1.84" (46.7 mm) | 0.94" (23.9 mm) | 1 5/8" |
| PU8 | 1/2" | 0.56" (14.2 mm) | 2.09" (53.1 mm) | 1.12" (28.4 mm) | 1 7/8" |
| PU12 | 3/4" | 0.75" (19.0 mm) | 2.68" (68.1 mm) | 1.42" (36.1 mm) | 2 7/8" |
| Pipe Union Operating Parameters | ||
| Pressure Temperature Ratings | For 1/8" to 1/2" pipe unions, use the 1/2" curve on the Performance Data chart | |
| Maximum Ambient Temperature | 200°F (93°C) for 1/8" and 1/4", 175°F (79°C) for 3/8" and 150°F (65°C) for 1/2" and 3/4" | |
| Lock Nut Torque | 1/8" and 1/4" - Hand tighten plus 3/4-turn by wrench or 40 ±5 inch/lbs | |
| 3/8" - Hand tighten plus 1/8-turn by wrench or 50 ±5 inch/lbs | ||
| 1/2" and 3/4" - Hand tighten plus 1/8-turn by wrench or 60 ±5 inch/lbs | ||
Pipe Thread (NPT) Assembly Procedure
- Apply PTFE tape or paste sealant to MNPT threads starting one thread back from end of fitting.
- When using tape, tightly wrap in direction of threads to conform tape to thread shape.
a. Use 3 1/2 to 4 wraps of tape when assembling PFA threads to PFA material.
b. Use 4 to 5 wraps of tape when assembling PFA threads to a material other than PFA. - Thread the fitting onto the mating component until hand tight.
- Using a wrench, tighten fitting about 4 turns past hand tight.
PTFE tape = 1/2" wide for all NPT fittings
Note: PTFE tape is not recommended for use in a gaseous application.
Torque (in•lbs x .11298 = newton•m)
| In•lbs | Newton•m | |
| 1/16" | 5.0 | 0.57 |
| 1/8" | 7.0 | 0.79 |
| 1/4" | 16 | 1.81 |
| 3/8" | 23 | 2.60 |
| 1/2" | 30 | 3.39 |
| 3/4" | 54 | 6.10 |
| 1" | 78 | 8.81 |
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